Permanent Power Limitation; Power Limitation Activated By Digital Inputs; Power Limitation Process - Daikin Altherma Installer's Reference Manual

5 Application guidelines
INFORMATION
Power consumption
applications with booster heater.
5.6.1

Permanent power limitation

Permanent power limitation is useful to assure a maximum power or
current input of the system. In some countries, legislation limits the
maximum power consumption for space heating and DHW
production. Example: The maximum power input depends on the
area of the house and an annual fee has to be paid to the electrical
company according to the size of the installed field fuse. By
permanently limiting the maximum power or current of the system,
you can install smaller field fuses.
NOTICE
When the current control is intended to reduce the installed
field fuse sizes, the field fuse will trip to protect the field
wires in case of overcurrents caused by the unit. Make
sure the selection of the field fuse complies with applicable
legislation.
P
i
a
DI
b
t
P Power input
i
t Time
DI Digital input (power limitation level)
a Power limitation active
b Actual power input
Setup and configuration
▪ No additional equipment needed.
▪ Set the power consumption control settings in [A.6.3.1] via the
user interface (for the
"8 Configuration" on page 42):
▪ Select full time limitation mode
▪ Select the type of limitation (power in kW or current in A)
▪ Set the desired power limitation level
NOTICE
Mind the following guidelines when selecting the desired
power limitation level:
▪ Set a minimum power consumption of ±3.6 kW to
guarantee defrost operation. Otherwise, if defrosting is
interrupted several times, the heat exchanger will
freeze up.
▪ Set a minimum power consumption of ±3 kW to
guarantee space heating and DHW production by
allowing at least one electrical heater (backup heater
step 1 or booster heater).
5.6.2 Power limitation activated by digital
inputs
Power limitation is also useful in combination with an energy
management system.
The power or current of the entire Daikin system is limited
dynamically by digital inputs (maximum four steps). Each power
limitation level is set via the user interface by limiting one of the
following:
▪ Current (in A)
Installer reference guide
20
control CANNOT be used
description of all settings,
▪ Power input (in kW)
The energy management system (field supply) decides the activation
in
of a certain power limitation level. Example: To limit the maximum
power of the entire house (lighting, domestic appliances, space
heating...).
D
a
5
4
3
A8P 2
1
b
A B C
A Outdoor unit
B Indoor unit
C DHW tank
D Energy management system
a Power limitation activation (4 digital inputs)
b Backup heater
c Booster heater
P
i
a
DI4
DI3
DI1
P Power input
i
t Time
DI Digital inputs (power limitation levels)
a Power limitation active
b Actual power input
Setup
▪ Demand PCB (option EKRP1AHTA) needed.
▪ Maximum four digital
see
corresponding power limitation level:
▪ DI1 = weakest limitation (highest energy consumption)
▪ DI4 = strongest limitation (lowest energy consumption)
▪ For the specification and the connection of the digital inputs, see
"15.6 Wiring diagram – components: Indoor unit" on page 84.
Configuration
Set the power consumption control settings in [A.6.3.1] via the user
interface (for the description of all settings, see "8 Configuration" on
page 42):
▪ Select activation by digital inputs.
▪ Select the type of limitation (power in kW or current in A).
▪ Set the desired power limitation level corresponding to each digital
input.
INFORMATION
In case more than 1 digital input is closed (at the same
time), the digital input priority is fixed: DI4 priority>...>DI1.
5.6.3

Power limitation process

The outdoor unit has better efficiency than the electrical heaters.
Therefore, the electrical heaters are limited and turned OFF first.
The system limits power consumption in the following order:
1 Limits certain electrical heaters.
c
b
t
inputs are used to
ERLQ004~008CAV3 + EHBH/X04+08CA
Daikin Altherma - Low Temperature Split
4P313774-1C – 2012.11
activate the